Your word, 'bakebook', is a real word. It's a legitimate compound from 'bake' and 'book'; it follows the model of 'cookbook' with a greater degree of specificity; it will be readily understood and convey the meaning you intend:
A cookbook exclusively for baking.
In English, compounding is the most common method of word formation:
In linguistics, the process of combining two words (free morphemes) to create a new word (commonly a noun, verb, or adjective). Also called composition.
Compounds are written sometimes as one word (sunglasses), sometimes as two hyphenated words (life-threatening), and sometimes as two separate words (football stadium).
Compounding is the most common type of word-formation in English.
[From Glossary of Grammatical and Rhetorical Terms (website), "Compounding - Definition and Examples of Compounding Words in English", by Richard Nordquist, Grammar & Composition Expert.]
Of English compounds, noun ('bake, n. or adj.'), adjective, and verb ('to bake') plus noun ('book') are among the most common:
Compounding is the word formation process in which two or more lexemes combine into a single new word. Compound words may be written as one word or as two words joined with a hyphen. For example:
- noun-noun compound: note + book → notebook
- adjective-noun compound: blue + berry → blueberry
- verb-noun compound: work + room → workroom
[From Bright Hub Education (website), "Word Formation: Compounding, Clipping, and Blending".]